<MduiAvatar Class="mdui-m-a-1">
    <MduiIcon Icon="folder" />
</MduiAvatar>
<MduiAvatar Class="mdui-m-a-1 mdui-color-theme">
    <MduiIcon Icon="assignment" />
</MduiAvatar>
<MduiAvatar Class="mdui-m-a-1">
    <MduiIcon Color="@Colors.Theme.Primary" Icon="assignment" />
</MduiAvatar>